I have sector of cylinder with inner radius $r_1$ and outer radius of $r_2$ enter image description here

Now, the current goes through inner radius surface to outer radius surface, it has resistivity $\rho$, and has thickness of cylinder $h$ From the top view, it looks like below.

enter image description here

Its central angle is $\frac{2\pi}{n}$.

Now I want to calculate the total resistance of this sector(is this how we call this figure?), what I did was

$$ dR=\rho\frac{dr}{A}=\rho\frac{dr}{h2\pi r/n} $$ $$ R_{tot}=\frac{n\rho}{2\pi h}\int^{r_2}_{r_1}\frac{1}{r}dr =\frac{n\rho}{2\pi h}\ln\left(\frac{r_2}{r_1}\right) $$

Is this correct?

Moreover, it was sheet resistance $R_s$. Can I replace this with resistivity $\rho=h\times R_s$?

  • $\begingroup$ Appears correct. $\endgroup$
    – Gert
    Commented Sep 27, 2016 at 23:15

1 Answer 1


Your way to calculate the resistance and your answer are correct. In this formula you can also express resistivity by sheet resistance $\rho = h \cdot R_\mathrm{s}$.


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